福建千年桐种源叶片δ13C与环境及叶碳氮含量的关系

doi:10.11849/zrzyxb.2013.08.006

摘要/Abstract

摘要： 选取福建省不同千年桐种源在同一条件下人工培育,通过测定千年桐叶片稳定碳同位素比率(δ¹³C),分析千年桐叶片δ¹³C的特征及其种源差异,以及环境因素和种源生长对其的影响。结果表明,千年桐种源叶片δ¹³C的变化范围在-26.06‰~-24.46‰之间,平均值为-25.54‰,其中莆田、顺昌和沙县种源δ¹³C值较大。千年桐种源叶片δ¹³C值与经纬度之间相关性不显著,与年均温度呈显著正相关,与年均降水量呈显著负相关,年均温度和年均降水量是千年桐δ¹³C值变化的主要限制因素。千年桐种源叶片δ¹³C值与叶N含量以及C/N呈现二次曲线相关性。结合叶片δ¹³C及其对环境因素的响应,莆田、顺昌、沙县千年桐种源具有较高的δ¹³C值,对应较高的水分利用效率,可以考虑栽植在较干旱、贫瘠环境中作为先锋树种,其落叶阔叶的特性也有助于养分回归、改良地力;而政和、尤溪、建阳种源的δ¹³C值相对较小,建议栽植在水分条件较好的湿润地区,充分发挥对水分的摄取能力,提高其生长量。

关键词: 千年桐, 种源, 稳定碳同位素比率, 水分利用效率

Abstract: Aleurites montana from six different sites were taken as "target" plants and planted in a chosen site with the same treatments. The foliar carbon isotopic composition (δ¹³C) and discrimination (△¹³C) traits, the site differences in δ¹³C and △¹³C, and the effects of environment and growth on foliar δ¹³C were analyzed by determining the foliar δ¹³C and △¹³C values. The results showed that the foliar δ¹³C values of different A.montana provenances ranged from -26.06‰~-24.46‰, with the average value of -25.54‰. Putian, Shunchang and Shaxian provenances had higher δ¹³C values. The foliar δ¹³C was not closely correlated with longitude and latitude, but significantly positively correlated with annual mean temperature (AMT) and negatively correlated with annual mean precipitation (AMP). Therefore, the foliar δ¹³C of A.montana is greatly influenced by environmental factors, among which AMT and AMP are essential factors contributing to the differences in foliar δ¹³C. The foliar δ¹³C showed a second-degree parabola correlation with the foliar N content and C/N. Based on foliar δ¹³C values, the water use efficiency (WUE) of Putian, Shunchang and Shaxian provenances were relatively high. In silviculture practice, the A.montana from Putian, Shunchang and Shaxian provenances were recommended to be planted in semi-arid and nutrient-deficient sites as pioneer trees, helping to enhance the nutrient returning and improve the soil fertility. On the other hand, with lower foliar δ¹³C values, the A.montana from Zhenghe, Youxi and Jianyang provenances were suggested to be planted in moist sites so as to fully exert the water taken capacity and improve the growth.

Key words: provenance, Aleurites montana, δ¹³C, WUE

中图分类号:

S718.5

林晗, 陈辉, 吴承祯, 洪滔, 陈灿, 陈建忠, 刘剑斌, 肖应忠. 福建千年桐种源叶片δ¹³C与环境及叶碳氮含量的关系[J]. 自然资源学报, 2013, 28(8): 1328-1336.

LIN Han, CHEN Hui, WU Cheng-zhen, HONG Tao, CHEN Can, CHEN Jian-zhong, LIU Jian-bin, XIAO Ying-zhong. Relationship between Foliar δ¹³C and Environmental Factors and Foliar C and N Contents of Aleurites montana in Fujian Province[J]. JOURNAL OF NATURAL RESOURCES, 2013, 28(8): 1328-1336.

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福建千年桐种源叶片δ¹³C与环境及叶碳氮含量的关系

Relationship between Foliar δ¹³C and Environmental Factors and Foliar C and N Contents of Aleurites montana in Fujian Province

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